Within minutes, late on Tuesday night, Coinbase CEO Brian Armstrong wrote a blog post in which he laid out Coinbase’s employee trading policy and announced that the company will investigate possible insider trading by its own employees.

“We’ve had a trading policy in place for some time at Coinbase. The policy prohibits employees and contractors from trading on “material non-public information,” such as when a new asset will be added to our platform,” Armstrong wrote. “Given the price increase in the hours leading up the announcement, we will be conducting an investigation into this matter. If we find evidence of any employee or contractor violating our policies — directly or indirectly — I will not hesitate to terminate the employee immediately and take appropriate legal action.”

Bitcoin cash resulted from a fork of the bitcoin blockchain on Aug. 1 of this year. The fork was intended to create a separate blockchain that could move faster. The original bitcoin blockchain has a block size limit of 1 MB, while bitcoin cash runs on a blockchain with block size limit of 8 MB.

Coinbase had to halt trading of bitcoin cash on its platform just four minutes after adding it on Tuesday night. It says BCH trading will resume at noon EST on Wednesday.

Disclosure: The author owns less than 1 bitcoin, purchased in 2015 for reporting purposes.

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Daniel Roberts covers bitcoin and blockchain at Yahoo Finance. Follow him on Twitter at @readDanwrite.